plane convex lens

例句：

1. 1. The pilot was able toland the plane safely.
   飞行员成功地将飞机安全降落。
2. 2. He boarded the plane andtook his seat.
   他登上飞机，找到了自己的座位。
3. 3. The flight attendants were busychecking everyone's bags before takeoff.
   乘务员在起飞前忙着检查每个人的行李。